Green Lantern Corps Vol. 4 (The New 52)

The Guardians are dead, leaving the Corps to fend for itself. Now, it's up to John Stewart to train a group of rookies with deadly foes hot on their tails and rings that aren't functioning properly. And there's an ancient evil lurking at the edge of the universe that threatens to extinguish their lives forever! This new title collects GREEN LANTERN CORPS #21-27 and ANNUAL #2.